package string;

public class StringAndStringBuilder {
    public static void main(String[] args) {

        StringBuilder builder = new StringBuilder("a");
        for(int i=0;i<1000000;i++){
            builder.append("a");
        }
        System.out.println(builder);
        System.out.println("执行完毕");

        /*
        String str = "a";
        for(int i=0;i<1000000;i++){
            str = str + "a";
        }
        System.out.println(str);
        */
    }
}
